linear battery chargers, bq2405x, TI, Texas Instruments,

TI - 800-mA, 30V linear battery chargers with automatic USB detection

News Release from: Texas Instruments
12 October 2009

Texas Instruments has introduced two families of 800-mA USB battery chargers with automatic USB detection for single-cell, lithium-ion (Li-Ion) battery-powered electronics. The bq2404x and bq2405x battery charger integrated circuits have a high input-voltage range of up to 30 V, and 6.6-V overvoltage protection to support handheld devices, from entry-level feature phones to smartphones, and other low-power handheld devices, that may use low-cost adapters.

The bq2405x’s automatic USB detection feature can intelligently detect if a power source is a dedicated power adapter or USB port. This allows a system to start immediate fast charging if a USB transceiver is unavailable due to a discharged battery.

Key features of the bq2404x and bq2405x battery chargers:

· Charging accuracy: one percent charge voltage and 10 percent current accuracy using single-output channel

· USB compliance: USB current limiting and input voltage dynamic power management

· System safety: complies with JEITA guidelines; 30-V input rating and overvoltage protection and includes a 10-hour safety timer

· System flexibility: bq2405x has automatic input source detection of USB port or a dedicated power adapter